CVE-2021-29970
A malicious webpage could have triggered a use-after-free, memory corruption, and a potentially exploitable crash. *This bug could only be triggered when accessibility was enabled.*. This vulnerability affects Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90. Date published : 2021-08-05 https://bugzilla.mozilla.org/show_bug.cgi?id=1709976